I'm interested in how you determined this because when I go to Cato's site "Freedom in the 50 states"
https://www.freedominthe50states.org/assets, South Dakota ranks good in several areas, although at the very top in none, in the "Fiscal Freedom" category. I've been doing web searches to try to see where Cato evalulated the actuarial soundess of the SD public pension system. Not finding it, I'm sure I'm missing it though. Could be just duckduckgo also, I try not to use Google if I can avoid it, but, at times it really does work better.